[Libav-user] Audio quality loss while encoding

[Paul B Mahol]

On 4/24/13, Pradeep Karosiya <praks411 at gmail.com> wrote:
> Hi
> I'm trying to encode decoded audio sample to an avi file. The audio samples
> are decoded from different file. So I've both input and output file. The
> decoded audio samples are in AV_SAMPLE_FMT_FLTP (float planar) in one large
> buffer. The first half contains channel 0 while second half of buffer

They are not in one large buffer. They are in two separate buffers.

> contains channel 1. I'm passing these decoded sample as it is without any
> conversion for encoding.
> The codec id used is AV_CODEC_ID_AAC. The encoding goes fine but I'm
> getting
> some noise is the final audio output. The quality is getting degraded.
> However if the number of channels is 1 then I'm getting same quality as the
> input file
>
> The audio parameter which are used for encoding (mostly same as decoding).
> Sample Rate = 44100,  Num of Channels = 1/2, Sample Format = float planar
> (AV_SAMPLE_FMT_FLTP),
> Bit Rate = 128000 (set by me not sure what to take), codec_id =
> AV_CODEC_ID_AAC.
>
> Audio encoding api : avcodec_encode_audio2
>
> Please let me what could be going wrong.
>
> Thanks
> Pradeep
>
>
>
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